4-trifluoromethyl-6,4&#39;-dinitrodiphenyl ethers



Ice Patented Jar i. 7, 1969 3,420,39 a g s g fnglfuggggpunds of the general Formula I 4-TRIFLUOROMETHYL-6,4'-DINITRODIPHENYL ETHERS I CI OF Henry Martin, Basel, Hans Aebi, Riehen, and Ludwig a Ebner, Stein, Aargall, Switzerland, assignors to Ciba 5 Limited, Basel, Switzerland, a Swiss company 1 02 No Drawing. Continuation-impart of application Ser. No.

256,243, Feb. 5, 1963. This application Jan. 18, 1966, -Q m Ser. N0. 521,427 I Claims priority, application Switzerland, Feb. 8, 1962, A711; N01

1 567/62 US. (:1. 260-612 5 Claims Br-O-CF: 1m. (:1. con 43/28; C07c 43/20 I N02 ABSTRACT OF THE DISCLOSURE Cl-Q-O-Q-CF:

Compounds are provided which are represented by the formula (IJHz I H3 N O wherein A represents a phenyl radical substituted by a 5 I bromine atom, 2 to 3 chlorine atoms, 2 alkyl radicals, a

lower alkoxy radical, the nitro group, the CF -group, the

-SO NH group, the cyano group or the group SCN, cHi-o and X represents oxygen or sulfur.

NO: The compounds of this invention are especially useful as herbicides.

This is a continuation-impart of our copending application Ser. No. 256,243, filed Feb. 5, 1963, now abandoned. (My 85 86 Q prepared according to Example 4a).

The present invention provides now compounds of the formula CFr-QO-Q-CFS 1 102 AX-C F3 wherein A represents a phenyl radical substituted by a member selected from the group consisting of the bromine atom, 2 to 3 chlorine atoms, 2 alkyl radicals, a lower alkoxy radical, the nitro group, the CF -group, the

SO NH group, the cyano group and the group SCN, N0

and X represents a member selected from the group consisting of oxygen and sulfur. HzNOaS-Q-O-QC F;

The compounds of the general Formula I are useful as herbicides, more particularly for selectively combating weeds, e.g. in crop cultures.

Compounds of the general Formula I that are particuo C larly efiective are those which contain as active principle 1 represented by the general Formula I are the compounds N02 HzNSOr-QO-QCF:

Ra Rs 1 102 a compound of the general Formula I wherein X repreof the formula 60 01- o-Q-c F: wherein R represents a member selected from the group I sents oxygen.

A particularly useful class of compounds of the type NOS Q Q on consisting of a lower alkoxy radical, the group NO and the cyano group, R represents a member selected from the group consisting of hydrogen and the methyl radical, and R represents a member selected from the group con- HI N02 sisting of hydrogen and chlorine.

M.P.: 127-128 C. (from para-nitro-thiophenolate and 3-nitro-4-chloro-benzotrifluoride) M.P.: 109-110" C. (from para-chloro-thiophenolate and 3-nitro-4-chloro-benzotrifluoride) The compounds of the general Formula I display pronounced pre-emergence and post-emergence effects, above all towards different kinds of Gramina and are, for example, excellently suited for Weed control in grain cultures and in cultures of dicotyledons.

The. compound of the general Formulae I are advantageously used in the form of preparations containing the active principle in emulsified, dispersed or dissolved form, or incorporated with dusting agents, either by themselves or in conjunction with other weed killers, fertilizers or pesticides. To manufacture solutions suitable for immediate spraying there are used, for example, petroleum fractions having a medium to high boiling range, such as Diesel oil or kerosene, also coal tar oils, oils of vegetable or animal origin, andhyd'rocarbons of medium to high molecular weight, such as alkylated naphthalene or tetrahyd-ronaphthalene, if desired with the use of mixtures of xylenes or toluenes, or ketones, or alcohols such as cyclohexanone or cyclohexano'l, also chlorinated hydrocarbons such as tetrachloroethane, trichlorobenzene, trichlorotoluene or chloroxylenol.

Aqueous forms of application are prepared from emulsion concentrates, pastes or Wetta'ble spray powders by addition of water. Suitable emulsifying or dispersing agents are non-ionic products, for example condensation products of ethylene oxide with aliphatic alcohols, amines or carboxylic acids having a long-chain hydrocarbon radical of about to 30 carbon atoms, such as the condensation product from: octadecyl alcohol with 25 to 30 mols of ethylene oxide, or commercial oleylamine with mols of ethylene oxide, or dodecylmercaptan with 12 mols of ethylene oxide.

From among suitable anionic emulsifying agents there maybe mentioned: the sodium salt of dodecyl-benzenesulfonic acid, the potassium or triethanolamine salt of oleic or abietic acid or of mixtures of these acids, and the sodium salt of a petroleum-sulfonic acid. Suitable cationic dispersing agents are quaternary ammonium compounds, such as 'cetyl pyridinium bromide or dihydroxyethyl benzyldodecyl ammonium chloride.

For the manufacture of scattering or dusting preparations, including for instance granulates, there may be used as solid vehicles talcum, kaolin, bentonite, calcium carbonate, calcium phosphate or carbon, cork meal, wood meal or other materials. With the various forms in which the new compounds are applied there may be incorporated the conventional additives capable of improving the distribution, adhesion, stability to rain, or the penetration, such as fatty acids, resins, glue, casein or, for example, also alginates.

The terms weeds and undesired plants that can be controlled with the new preparations include also undesired culture plants, for example such as have been grown previously on the field to be treated.

The compounds of the general Formula I can be prepared by known methods, for example, by reacting a 4 compound of the general Formula AXH (in which A and X have the meaning given it in defining the general Formula I with a compound of the general formula Hal 0 Fa in which Hal represents a halogen, preferably a chlorine or bromine atomaccompanied by elimination of a compound H Hal.

The reaction is advantageously carried out in a solvent, for example in water, dimethylformamid'e or a mixture of dimethylformamide and water. The reaction is preferably performed at the boiling temperature of the solvent. In order to neutralize the hydrohalic acid formed, it is of advantage to Work in the presence of an alkali, for example an alkali hydroxide, carbonate or bicarbonate.

The compounds of the invention possess further a significant effectiveness against harmful insects, more particularly an ovicidal action against Ephestia kuehniella, against harmful micro-organisms more particularly phytopathogenic fungi, such as Septoria apii, against harmful acarids and against harmful nematodes, such as Panegrellus redivivus. The action of the compound of the formula Example 1 (a) The compound of the formula I l CH3 N 02 is prepared in the following manner:

A mixture of 142.4 g. of pa-ra-chlorometacresol and 225.4 g. of 3-nitro-4-chloro benzotrifluoride is heated in a flask to 150 C., and at the same temperature a solution of 45 g. of caustic potash in 56 cc. of water is dropped in within minutes. The bulk of the water in the flask is distilled off, while returning the oily phase passing over together with the water to the flask. The reaction mate-rial in the flask is then heated for 6 /2 hours at 175 C., poured into a porcelain dish, acidified with hydrochloric acid and then transferred to a suitable flask from which a steam distillation is carried out. The residue is poured into a mortar where it solidifies. The mass is then washed on a suction filter until the washings run neutral, dried under vacuum at 50 C. and distilled in a high vacuum.

Boiling point: to C. under 0.05 mm. Hg pressure. On recrystallization from hexane the resulting pure product melts at 58 to 585 C. Yield: 260 grams.

Analysis.Calculated, percent: C, 50.70; H, 2.72; N, 4.22; Cl, 10.69. Found, percent: C, 50.91; H, 2.48; N, 4.10; Cl, 10.80.

By the method described under (a)above also the following oompounds may be prepared:

(from 3:4-dichlorophenol and 3-nitro-4-chlorobenzotrifluoride) in the form of a liquid boiling at 134-138 C under 0.07 mm. Hg pressure.

Analysis.-Calculated, percent: C, 44.34; H, 1.72; N, 3.98; Cl, 20.14. Found,percent: C, 44.14; H, 1.60; N, 4.01; Cl, 20.19.

(from para-bromophenol and 3-nitro-4-chlorobenzotrifluoride). Melting point (after recrystallization from hexane): 4647 C.

Analysis.-Calculated, percent: C, 43.12; H, 1.95; N, 3.87; Cl, 22.07. Found, percent: C, 43.17; H, 1.98; N, 3.61; C1, 22.29.

( CH: N 02 (from 4-chloro-3:S-dimethylphenol and 3-nitro-4-chlorobenzotrifluoride Boiling point: 175182 C. under 2 mm. Hg pressure.

Melting point (after recrystallization from hexane): 105-106 C.

Analysis-Calculated, percent: C, 52.12; H, 3.21; N, 10.26. Found, percent: C, 52.2; H, 2.8; N, 10.4.

Example 2 There are prepared spray powders each containing 20% of one of the compounds (a) to (e) of Example 1, as well as 10% of an emulsifying agent consisting of a mixture of an alkylphenol polyglycol ether (for example the polyglycol ether from para-isooctylphenol with a calcium salt or magnesium salt of an alkyl-arornatic sulfonic acid, for example monolauryl benzenemonosulfonic acid).

The spray powders are mixed with any desired proportion of water, stable dispersions being obtained.

Example 3 Flowerpot filled with earth are seeded in a greenhouse with the following plants: Linum, Spinacia, Lactuca, Cucurnis, Daucus Phaseolus, Beta, Lepidium, Alopecurus, Poa, Dactylis, Lolium, Cynosurus, Agrostis, Phleum, Festuca, Bromus, Triticum, Avena and Hordeum.

The pre-emergence treatment is performed 2 days after seeding. The post emergence treatment is carried out 12 and 14 days after planting the afore-mentioned seeds, that is to say after the plants have developed the second true leaf.

Each pot is treated with a spray broth which has been prepared as described in Example 2 and contains 0.1% of the active principle described under (b) in Example 1, corresponding to an amount of 6 kg. of active principle per hectare. Evaluation performed days after the treat ment reveals the following values (0=no effect, to 10=plant completely killed off):

Preemergence Monocotyledons:

Alopecurus Hordeum Similar results are obtained by using instead of the emulsion prepared according to Example 2 one which contains the active principle shown under (a) or (c) in Example 1 instead of the active principle (b) of Example 1 and is otherwise of identical composition.

As the above test results shown the new preparations are especially suitable for the Selective control of grass weeds in grain cultures, for example in wheat or barley fields, and for use in certain dicotyledon cultures.

Example 4 (a) A solution of 10 g. of sodium hydroxide in 10 ml. of water is added dropwise to a solution of 34.8 g. of para-nitrophenol in 50 m1. of dimethylformamide, and the whole is heated to C., 56.4 g. of 4-chloro-3-nitrobenzo trifluoride are added in the course of 10 minutes and the reaction mixture is then kept at reflux temperature (bath temperature C.) for 2 hours while stirring thoroughly. The resulting reaction product is then poured on to ice, filtered, washed thoroughly first with water and then with ligroin. Melting point: 8586 C.

(b) In the same way as described above the compounds of the following formulae may be prepared:

No@ o@ o..

Example 5 parts of an emulsifier (Toximul MP of the firm Ninol Corp., Chicago), consisting of a mixture of a non-ionic and an anionic surfactant, and diluted with xylene to make 1000 m1. A clear solution is obtained which can be used as a spraying concentrate and be emulsified by being poured into water.

The following examples show results obtained with the compound described in Example 4(a). The compound of Example 4(a) was formulated as described in Example 5.

Example 6 (a) In greenhouse experiments the compound of Example 4(a) shows a good eflfect against various kinds of plants in post-emergence treatment.

The treatment is carried out with 2 and 4 kg. of active principle per hectare 12 days after seeding in flower pots when the plants have developed 1 to 2 true leaves (Table 1).

=wlthout damage; =plants completely killed.

(b) In a greenhouse the compound of Example 4(a) was sprayed on the surface of the soil 2 days after seeding various kinds of plants, i.e. in a pre-emergence treatment, in a quantity of 2 and 4 kg. of active principle per hectare.

The plants sown and the results obtained are shown in the following Table 2:

TABLE 2 Degree of damage Type of plant 2 kg. active 4 kg. active substance substance per hectare per hectare (c) In a field test the compound of Example 4(a) showed a strong effect in post-emergence treatment against various weeds, undesired grasses and some culture plants whilst not damaging other, important culture plants.

The treatment was carried out days after seeding with 2 and 4 kg. of active principle per hectare when the weeds had developed two true leaves and the culture plants 2 to 3 true leaves. The culture plants sown, the naturally growing weeds, and the results are shown in Table 3.

(d) In a field the compound of Example 4(a) was sprayed on the surface of the soil in a quantity of 2 and 5 kg. of active principle per hectare immediately after seeding of various types of plants, i.e. in the preemergence treatment.

The culture plants sown, the naturally growing weeds, and the results obtained are shown in Table 4.

Solamtm nigrumnr- Brassica kaber- Ambrosia artemisia Chenopodium album" TABLE 3 Degree of damage Type 0! plant 2 kg. active 4 kg. active substance substance per hectare per hectare Setaria glauca 4 10 Eleusine indica 5 8 Digitatrz'a sunguinalim 5 8 Mollugo vertt'czllata. 10 10 Amaranthus hybridus 10 10 10 10 A strong efiect on the weeds and a good selectivity in the case of rice, ground nuts and soja.

TABLE 4 Degree of damage Culture plants 2 kg. active 4 kg. active substance substance per hectare per hectare 2 2 0 0 0 6 0 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 Weeds:

Setaria glauca 8 9 Eleusine indica. 7 8 Digitan'a semi/4012's.. 7 8 Momma verticz'llata 10 10 Ammanthus hybridus- 10 Oypema diandrus. 10 10 Solanum nigrum 9 1O Brasszca kaber 8 9 Ambrosia artemisiaefolie. 7 9 Chemopodium album 10 9 wherein R represents a member selected from the group consisting of hydrogen and methyl and R represents a member selected from the group consisting of hydrogen and chlorine.

2. The compound according to claim 1 of the formula 3. The compound according to claim 1 of the formula CH3 N01 4. The compound according to claim 1 of the formula I l C1 NO 5. The compound of the formula References Cited UNITED STATES PATENTS 10 OTHER REFERENCES Ser. No. 304,859, Petitcolas (A.P.C.), published June 15, 1943. CHARLES B. PARKER, Primary Examiner.

S. T. LAWRENCE III, Assistant Examiner. 

